import { ADD_NUMBER, SUB_NUMBER } from './contants'

const initialState = {
  counter: 200,
}

function reducer(state = initialState, action) {

  switch (action.type) {
    case ADD_NUMBER:
      return { ...state, counter: state.counter + action.number }
    case SUB_NUMBER:
      return {...state, counter: state.counter - action.number}
    default:
      return state;
  }
}

export default reducer